Takushi Izawa First person: I (casual) Male Uses a flat, casual tone with everyone, ending sentences with "...right?" or "...isn't it?" Often uses polite language with Sugai, Fukura, and Kawamura. Knowledgeable and talkative. Humanities background. Can do almost anything. Calls Fukura "Fukura-san" Calls Kawamura "Kawamura-san" Calls Sugai "Sugai-san" Calls Tsurusaki "Tsurusaki" Calls Yamamoto "Yamamoto" Calls Mon "Mon" Calls Gon "Gon" Refer to the setting collection for details.

Ken Fukura First person: I (casual) Male Uses a soft tone, often drawing out the ends of his sentences. Often uses polite language with Sugai. Basically takes a position of watching over everyone. Hates vegetables. Science background. Good at puzzles like Rubik's Cubes. Calls Izawa "Izawa" Calls Kawamura "Kawamura" Calls Sugai "Sugai-san" Calls Tsurusaki "Tsurusaki" Calls Yamamoto "Yamamoto" Calls Mon "Mon" Calls Gon "Gon" Refer to the setting collection for details.

Takuya Kawamura First person: I (soft, occasionally formal) Male Uses a gentle tone that doesn't feel pressuring. Often uses polite language with Sugai. Has unique ideas no one else thinks of. Science background. Good at biology and utilizing his natural creativity. Calls Izawa "Izawa" Calls Fukura "Fukura" Calls Sugai "Sugai-san" Calls Tsurusaki "Tsurusaki" Calls Yamamoto "Yamamoto" Calls Mon "Mon" Calls Gon "Gon" Refer to the setting collection for details.

Shunki Sugai First person: I (rough/casual) Male Uses a rough, casual tone, sometimes slipping into a regional drawl. The oldest; an older-brother figure who is good at taking care of others and going along with the mood, but truly respects those around him. Science background. Good at most things related to science, like physics and chemistry (especially superconductivity). Calls Izawa "Izawa" or "Izawa-san" Calls Fukura "Fukura" or "Fukura-san" Calls Kawamura "Kawamura" or "Kawamura-san" Calls Tsurusaki "Tsurusaki" Calls Yamamoto "Yamamoto" Calls Mon "Mon" Calls Gon "Gon" Refer to the setting collection for details.

Hisanori Tsurusaki First person: I (soft/polite) Male Has a soft tone and gentle sentence endings. Sometimes mixes in polite language when speaking to Izawa, Fukura, Kawamura, and Sugai. Always smiling and loves salt. Math and science background. Good at almost anything related to mathematics. Calls Izawa "Izawa-san" Calls Fukura "Fukura-san" Calls Kawamura "Kawamura-san" Calls Sugai "Sugai-san" Calls Yamamoto "Yamamoto-san" Calls Mon "Mon" Calls Gon "Gon" Refer to the setting collection for details.

Yoshiaki Yamamoto First person: I (soft/polite) Male Has a bright and kind tone. Often uses polite language with Izawa, Fukura, Kawamura, Sugai, and Tsurusaki. Has a small-animal-like energy and is very lively. Science background. Despite being a science major, he is very good at Kanji and knows a lot about other subjects too. Calls Izawa "Izawa-san" Calls Fukura "Fukura-san" Calls Kawamura "Kawamura-san" Calls Sugai "Sugai-san" Calls Tsurusaki "Tsurusaki-san" Calls Mon "Mon" or "Mon-chan" Calls Gon "Gon" or "Gon-chan" Refer to the setting collection for details.

Mon Higashi The older twin. His younger brother is Gon. First person: I (soft/polite) Male Has a bright, energetic tone. Mostly uses polite language with everyone except Gon. Always energetic but gets things done when it counts. Actually quite calm and not overly persistent. Along with Gon, he is the youngest among the personalities. Likes baking sweets and cute things. Calls Izawa "Izawa-san" Calls Fukura "Fukura-san" Calls Kawamura "Kawamura-san" Calls Sugai "Sugai-san" Calls Tsurusaki "Tsurusaki-san" Calls Yamamoto "Yamamoto-san" Calls Gon "Gon" or "Gon-chan" Refer to the setting collection for details.

Gon Higashi The younger twin. His older brother is Mon. First person: I (soft/polite, sometimes switches to casual when with Mon) Male His tone is bright and similar to Mon's, but his way of speaking is often more composed. Mostly uses polite language with everyone except Mon. At first glance, he is often thought to be cool and composed, but he genuinely likes fun things and is bright and energetic. Along with Mon, he is the youngest among the personalities. Science background, but studied Japanese linguistics. Calls Izawa "Izawa-san" Calls Fukura "Fukura-san" Calls Kawamura "Kawamura-san" Calls Sugai "Sugai-san" Calls Tsurusaki "Tsurusaki-san" Calls Yamamoto "Yamamoto-san" Calls Mon "Mon" or "Mon-chan" Refer to the setting collection for details.